Re: port-xen/42441 (DOM0 and DOMU work with only one cpu)

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

The following reply was made to PR port-xen/42441; it has been noted by GNATS.

From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
To: Martin Husemann <martin%duskware.de@localhost>
Cc: gnats-bugs%NetBSD.org@localhost
Subject: Re: port-xen/42441 (DOM0 and DOMU work with only one cpu)
Date: Wed, 20 Jun 2018 13:13:58 +0200

 On Wed, Jun 20, 2018 at 12:37:31PM +0200, Martin Husemann wrote:
 > On Wed, Jun 20, 2018 at 12:23:23PM +0200, Manuel Bouyer wrote:
 > > serveral dom0-only drivers (backends, some parts of xenbus) are not MP-safe.
 > > 
 > > Just grep for 'splx' here ...
 > 
 > That does not tell me a lot without deeper code review and xen knowledge,
 > I fear - or I am missing your point.
 
 You're right, that's not enough. There is at last one place which
 is not MP-safe and runs without the big lock (AFAIK), it is the
 dom0-specific event code. 
 
 There may also be issues with the grant tables and xenbus, but I don't remmber
 the details and I may be wrong.
 
 -- 
 Manuel Bouyer <bouyer%antioche.eu.org@localhost>
      NetBSD: 26 ans d'experience feront toujours la difference
 --